bump; drop py2.6 support

(Portage version: 2.2.10/cvs/Linux x86_64, signed Manifest commit with key 0xB8072B0D)
version bump

(Portage version: 2.2.8-r1/cvs/Linux x86_64, signed Manifest commit with key 2B6559ED)
Backport patch to fix linking failures with libbtrfs, reported by dlan.

(Portage version: 2.2.10/cvs/Linux x86_64, signed Manifest commit with key 0BBEEA1FEA4843A4)
bump; drop py2.6 support

(Portage version: 2.2.10/cvs/Linux x86_64, signed Manifest commit with key 0xB8072B0D)